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IMPROVED SfTN-ErDRILLING MACHINE.

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TO ALL WHOM IT MAY CONGERN:

Be it known that ive, A. M. SOUTHARD and W. J'. HOBSON, of Savannah, in the county of Andrew, and in the State of Missouri, have invented certain new and useful Improvements in Stone-Drilling Machines; and

do hereby declare that the-following,l is a full, clear, and exact description thereof, reference being had to the' accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

In the annexed drawings, A A represent two uprights, which are erected at a suitable' distance apart upon the base, B. This base is provided with a headed bolt, z, working through anut at each of its four corners for the purpose of adjusting and regulating the position of the drilling-machine. The uprights and base are suitably braced together, as seen.

G G represent two metal-lic plates, which are secured upon the rear faces of the standards A A, near the upper ends thereof, and are provided with rack-bars at their upper ends. These plates are slotted, as seen, and are secured to the standards A A by headed bolts, which pass through said slots, thus allowing a vertical or endwise movement of'the plates up and down the standards the length'of their slots.

E represents a horizontal shaft, which is secured at the upper ,portion of the frame by means of suitable bearings, and is Vovided with a cog-wheel, F F, at each end, which meshes into the rack-bar in each of the slotted plates, an.; also with a lever, P, for operating the same. i i

It represents a curved metal plate, having cogteeth, and extending around one end of the shaft, to allow vthe lever to act upon', as hereinafter stated.

H represents a horizontal shaft, having its bearings en small'metal plates between the uprights A A, which extend inwards from the slotted plates G G, and moves up and down whenever the platesare so moved. One end of this shaft has a pinion'upon it, which meshes into a small'g'ear-wheel upon the inner ond of a short shaft having a crank-handle, J. Said shaft and cog-wheel are .secured upon one of the uprigh'ts A in front of the plate G, as seen. l

Upon the shaft H there is a series of curved arms', O O, having collars at their end, by which means they are attached to the shaft by set-screws. These arms are placed upon the shaft in a-'spiral form.

L L represents a series ofvvertical iron rods, with drill-teeth M M at their -lower ends. These bars pass through eyes e e, which are secured at one side of the frame by means of nuts upon a shank, attached `or forming part of them, within a slot in a bar, K, the other side of the eye resting in a groove in the bars C D of the frame. These eyes slide in their grooves and slots, and are adjustable by means of their nuts.

N N represent smooth metallic disks upon each of theA rods or bars L L. These disks are so placed with reference to the shaft H as to be operated upon by the curved arms O O.

When the shaft H is revolved, the curved part of the arms 0 0 catches under the disks N N, and raises them, withtheir bars, a certain distance, and after the points ofthe arms pass under the disks, the bars are partially rotated, and fall. The plates G G', with their shaft H,'n.re raised and lowered by means of the shaft F with its pinions, and thus the drills M M are caused to out deeper into the stone. The bars L L may be'- adjusted laterally by means of .the movable eyes heretofore described.

It will be seen that thearms O O, being placed uponv the shaft H in a. spiral form, cause. the bars L L to be raised successively, and but one at a time. The points M M can be removed for sharpening and other purposes, whenever so desired.

Upon lthe lower brace of the frame, between the standards, isA placed a'series of slottedmetal plates, z z', which are secured by set-screws, and intended to be slid under the ends of the bars L L when the-machine is to be moved, or not in use. f I

Upon the brace W of the frame, we place a water-can, Y, opp'osite each of the bars L. This brace W'is slotted nearly its entire length, within which slot is placed a headed bolt, Y, by which means the cans ars connected to the bracefbeing provided with a band of wire around each one fpr that purpose. lllhese cans are provided with suitable spouts, as shown in dotted lines, that project outward and then down, so as to convey the water down the side ofthe drills onto the stone.. A smnllband of thin metal is first passed around each can, and the Wire afterwards wound around the tin, so as to keep thecn in place-end prevent it from slipping oi'.` By means of these bolts working ,in the slot in thebraco, the cans con be adjusted to suit the drills.

The device herein specified is an improvement upon u patent for a. similar device, granted to us, September s, 1867.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is- 1. The arrangement of the cons V upon the `slotted brace W, by the bnndsz nnd'bolts y, for adjusting the sume `to operate with bars L L, as set forth.l

2. The slotted plates se z', when constructed and usedv in combnation with 4tliobnrsV LL; for the purposes described.

In testimony that we claim the foregoing, we have hereuntoI sel: our bands, this 2dv'day of December, 1867.

l A. M. soUTHAnD,

W. J.- HUBSQN.

Witnesses:

' '0. M. ALEXANDER,

J. M. Meson. 

